Air purifier



FIG. 1 is a front perspective view of an air purifier showing our new design;

FIG. 2 is a front view of the air purifier shown in FIG. 1;

FIG. 3 is a rear view of the air purifier shown in FIG. 1;

FIG. 4 is a left side view of the air purifier shown in FIG. 1;

FIG. 5 is a right side view of the air purifier shown in FIG. 1; and,

FIG. 6 is a top end view of the air purifier shown in FIG. 1.

The bottom is flat and lacks ornamentation. 

The ornamental design for an air purifier, as shown and described. 